Nuevos fungicidas para el control de la roña del manzano Venturia inaequalis (CKE) Wint, en Arteaga, Coahuila.

Abstract

The fungi of the Class Ascomycetes Venturia inaequalis (Cooke) Wint, which cause the disease know as apple scab, is the main problem in the Sierra de Arteaga apple ochards, wichs up to day account 8550 ha with an average of 2.5 millons of trees in production and 1.5 millons in the firsths develoment stages; from the above the present researching has the objetive to asses the eficiency of fungicides producys in order the control Venturia inaequalis, durining 1990 were selected 24 trees of the variety Golden Delicious, setting out at random design with six treatments and four repetitions. The experimental unit was one tree. The treatments were: 1) Difenoconazole (Score 1.0 cc)+ Zineb (Flonex Z 400, 20 cc); 2) Difenoconazole (Score 1.0 cc); 3) Myclobutanil (Rally 40 W 0.5 g); 4) Zineb (Flonex Z 400, 40 cc); 5) Metalaxil - Daconil (Ridomil - Bravo 10 g); 6) Testigo. The doses were mixed in 10 I of water and 2 cc, of adherent and dispersant Bionex per litre water; there were four aplications during the dates 3 and 18 of may, 20 jun 18 of may, 20 jun and 18 of july. The products which presented favorable tendency for the control of the desease were the treataments 2, 1 and 5, and the aplications number has the adecuate.